LINQ - include the list <string> in the dictionary <string, string>

Question

I just work on kata during lunch, and I got rid of ...

Here are the steps I'm trying to complete:

• Given the input string, split the string into a new string character
• Given the result of the string array of the previous step, skip the first element in the array
• Given the set of rows obtained in the previous step, create a collection consisting of every 2 elements

In this last statement, I mean, given this set of 4 lines:

{ "string1", "string2", "string3", "string4" } 

I have to finish this set of pairs (are these "tuples" the correct member?):

 { { "string1","string2" }, { "string3","string4" } } 

I started looking at ToDictionary and then moved on to choosing an anonymous type, but I'm not sure how to say "return the next two lines as a pair."

My code is like this at the time of writing:

 public void myMethod() { var splitInputString = input.Split('\n'); var dic = splitInputString.Skip(1).Select( /* each two elements */ ); } 

Cheers for the help!

James

Answer 1

Well, you can use (untested):

 var dic = splitInputStream.Zip(splitInputStream.Skip(1), (key, value) => new { key, value }) .Where((pair, index) => index % 2 == 0) .ToDictionary(pair => pair.key, pair => pair.value); 

The Zip part will end as follows:

 { "string1", "string2" } { "string2", "string3" } { "string3", "string4" } 

... and the Where pair using the index will skip every other record (which will be a "value with the following key").

Of course, if you really know that you have a List<string> to start with, you can just access the pairs by index, but that's boring ...